Priming motor before first fire - Strange result I think - Vintage Mustang Forums
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post #1 of 23 (permalink) Old 07-06-2019, 10:13 PM Thread Starter
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Priming motor before first fire - Strange result I think

Started priming using a priming tool and a heavy duty right angle drill. Started very slow with both valve cover off. Got oil to #7 intake in about 30 seconds, a lot of oil. Had to pause to let it drain. Tried again and now got some at a couple other rockers, but not nearly as much. Realized doing this without valve covers is not going to work. Took my original steel valve covers and slotted them, installed them and tried again. Still a lot of oil at #7I but getting oil at all of the rockers now but more of a drip, drip and the least amount oil at #1 and #5. As I was rotating the motor in 90 degree increments (for 2 full rotations) all of a sudden oil comes out of #7I and hits the wall 3 feet away. Inserted a shield of sorts and kept at it (you can see it in the pic). Every 90 degrees oil still shooting out of #7I and just moderate amount at all other rockers. I feel good about this, but curious as to why #7I like that?

By the way, oil pressure was 50-60 PSI on a physical gauge and I don't know RPM but I am guessing 400-500 RPM. Made pressure very fast and even at lower RPM.

This is a '68 302 block with Alum heads and a stock but new oil pump.

Oil well.JPG

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post #2 of 23 (permalink) Old 07-06-2019, 10:22 PM
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Something is not working right in there.


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post #3 of 23 (permalink) Old 07-06-2019, 10:42 PM
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Something is not working right in there.
I'll agree, something is amiss.

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post #4 of 23 (permalink) Old 07-06-2019, 11:14 PM
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Yeah, me too "something is amiss". Oil should pump up and dribble across the rockers after a bit of priming. What is the build history?

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post #5 of 23 (permalink) Old 07-06-2019, 11:27 PM
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are you spinning counter clockwise ?


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post #6 of 23 (permalink) Old 07-06-2019, 11:31 PM Thread Starter
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Yeah, me too "something is amiss". Oil should pump up and dribble across the rockers after a bit of priming. What is the build history?
All new parts except the block which was bored .040 and a bunch of other machine work. Comp cams lifters, push rods, roller tip rockers and camshaft. Edelbrock E-street 5023 heads. Assembled by me after days of research and fretting every detail.

I am wondering if I may have a defective lifter in #7I. Ironic as the first set I had which I returned due to some rust pits I had taken apart all 16. This new set I did not take apart before install.
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post #7 of 23 (permalink) Old 07-06-2019, 11:34 PM Thread Starter
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are you spinning counter clockwise ?
Yes I am.
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post #8 of 23 (permalink) Old 07-06-2019, 11:50 PM Thread Starter
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Correction. It is #7 Exhaust valve but I don't think that makes any difference (I always forget the 5-8 side reverse for I and E). I also just ran another couple cycles on the crank (not priming) and that #7 valve does open and close as it should or at least as all the others do. So a bad lifter seems less likely.

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post #9 of 23 (permalink) Old 07-07-2019, 03:05 AM Thread Starter
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Well, after thinking long and hard about possible failure modes, the only thing possible is a bad lifter as I am getting oil to other lifters so cant be plugged valley.

45 minutes later after tearing down I have #7E lifter in hand and get it apart. Weird as it is very different from the ones I just returned which are same part number (design change it looks like). Pulled #7I lifter to compare and it is the same as 7E design (and was working fine). The black metering disc is solid and I notice that the one from the suspect lifter is BENT! Confirmed the other was straight. This explains why oil was gushing as there is no metering on #7E. Th black plate has engineered flow paths to control oil flow to the push rod. The installs right under the top cap which feeds the push rod

So no cam break in Sunday which is a bummer as I am totally ready. I am very concerned about all my Comp Cam parts and may get a different brand of lifter. I rotated the motor manually probably 20-30 revolutions during various static checks but I would not think that would be an issue going to a new lifter as the cam has not been broken in yet.

I am so glad I primed with valve covers off.

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post #10 of 23 (permalink) Old 07-07-2019, 03:09 AM
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I would look at that #7 lifter. It sort of sounds like it is not bleeding or leaking down properly on each stroke and then at some point the pressure all lets go at once like the lifter is collapsing. Frankly, I'm not sure how you can test a hydraulic lifter. If you take it apart you may see something obvious like some blockage inside or one of the springs is broken or something. With most all of the oil drained out you may find that something is sticking inside the lifter like the plunger piston or I don't know.


Ok never mind, LOL. I didn't see your last post.
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post #11 of 23 (permalink) Old 07-07-2019, 08:07 AM
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My hat is off for your diligence, to many would have thrown the covers on and run the motor! Not a good story for Comp...
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post #12 of 23 (permalink) Old 07-07-2019, 10:58 AM Thread Starter
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My hat is off for your diligence, to many would have thrown the covers on and run the motor! Not a good story for Comp...
Thanks. With the oil pressure I am making, the motor might have run fine but who knows. It may have eaten the cam on break in starving other areas. Crap shot for sure.

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post #13 of 23 (permalink) Old 07-07-2019, 12:06 PM
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Thanks. With the oil pressure I am making, the motor might have run fine but who knows. It may have eaten the cam on break in starving other areas. Crap shot for sure.

Engine oiling is basically one large controlled leak, in the right areas. What you found is definitely no bueno.

This is a great lesson for those that say why check? Just throw it together...
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post #14 of 23 (permalink) Old 07-07-2019, 02:28 PM
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My guess is that there is some blockage somewhere internally, perhaps a small piece of dirt or machining debris. I recall priming a rebuilt 289 and one of the rocker oiling holes remained dry. A pick in the hole harvested some crud. Problem solved. Hope your solution is as easy.

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post #15 of 23 (permalink) Old 07-07-2019, 03:54 PM Thread Starter
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My guess is that there is some blockage somewhere internally, perhaps a small piece of dirt or machining debris. I recall priming a rebuilt 289 and one of the rocker oiling holes remained dry. A pick in the hole harvested some crud. Problem solved. Hope your solution is as easy.
Thanks for the suggestion. See post 9. I found a defective lifter with a bent orifice plate that allows oil to free flow essentially at that lifter.

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